TY - JOUR
T1 - Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO3 1 δ as a new bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions
AU - Zhang, Wenrui
AU - Shiraiwa, Masahiro
AU - Wang, Nannan
AU - Ma, Tingli
AU - Fujii, Kotaro
AU - Niwa, Eiki
AU - Yashima, Masatomo
N1 - Funding Information:
We thank Daiichi-Kigenso-Kagaku-Kogyo Co. Ltd. for the ICP-OES measurements. We also acknowledge Dr. Yanqiang Li and Mr. Keisuke Hibino for useful discussions. We would like to express thanks to Prof. T. Ishigaki and Prof. A. Hoshikawa of Ibaraki University for the assistance in the neutron-diffraction measurements. The neutron-diffraction measurements were carried out by the approval (Proposal Nos. 2017A0023, 2017A0064 and 2017B0143). This study was partly supported by Grants-in-Aid for Scientific Research (KAKENHI, Nos. 15H02291, 16H00884, 16H06293, 16H06440, 16H06438, 17K17717, 17H06222) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and JSPS Core-to-Core Program, A. Advanced Research Networks (Solid Oxide Interfaces for Faster Ion Transport).
Funding Information:
Acknowledgements We thank Daiichi-Kigenso-Kagaku-Kogyo Co. Ltd. for the ICP-OES measurements. We also acknowledge Dr. Yanqiang Li and Mr. Keisuke Hibino for useful discussions. We would like to express thanks to Prof. T. Ishigaki and Prof. A. Hoshikawa of Ibaraki University for the assistance in the neutron-diffraction measurements. The neutron-diffraction measurements were carried out by the approval (Proposal Nos. 2017A0023, 2017A0064 and 2017B0143). This study was partly supported by Grants-in-Aid for Scientific Research (KAKENHI, Nos. 15H02291, 16H00884, 16H06293, 16H06440, 16H06438, 17K17717, 17H06222) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and JSPS Core-to-Core Program, A. Advanced Research Networks (Solid Oxide Interfaces for Faster Ion Transport).
Publisher Copyright:
©2018 The Ceramic Society of Japan.
PY - 2018/10
Y1 - 2018/10
N2 - Electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) play an important role in renewable energy source technologies, typically including metal-air batteries, fuel cells and water splitting devices. Therefore, the development of bifunctional catalysts for OER and ORR is of great importance to enhance the performance of these devices. Herein, we present a Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO3 1 δ, as a novel bifunctional catalyst for OER and ORR. Here δ is the content of oxygen vacancies. Rietveld refinement of the X-ray powder diffraction data of Pr2/3Ba1/3CoO2.98 was successfully performed by a single phase with an orthorhombic Pnma Pr/Ba cation-disordered perovskite-type structure. The bond valence sum of Co cation, 3.11 and thermogravimetric measurements suggested the coexistence of Co3+, Co4+, Pr3+ and Pr4+ cations in the bulk Pr2/3Ba1/3CoO2.98. The X-ray photoemission spectroscopy of Pr2/3Ba1/3CoO2.98 indicated the coexistence of these four cations at the sample surface, which would improve the electrocatalysis. The electrical conductivity · of Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO3 1 δ was higher than that of Pr/Ba cation-ordered layered perovskite PrBaCo2O6 1 δ. The · of Pr2/3Ba1/3CoO3 1 δ and PrBaCo2O6 1 δ decreased with an increase of temperature. The concentration of oxygen vacancies δ of Pr2/3Ba1/3CoO3 1 δ increased with increasing temperature. Electrochemical measurements of the Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO2.98 indicated higher OER and ORR catalytic activities, compared to the Pr/Ba cation-ordered layered perovskite PrBaCo2O6 1 δ. The Pr2/3Ba1/3CoO2.98 exhibited higher bifunctional electrocatalytic activities compared with many bifunctional catalysts in the literature. These results highlight the Pr/Ba cation-disordered perovskite-type Pr2/3Ba1/3CoO3 1 δ as a promising bifunctional catalyst for renewable energy applications.
AB - Electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) play an important role in renewable energy source technologies, typically including metal-air batteries, fuel cells and water splitting devices. Therefore, the development of bifunctional catalysts for OER and ORR is of great importance to enhance the performance of these devices. Herein, we present a Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO3 1 δ, as a novel bifunctional catalyst for OER and ORR. Here δ is the content of oxygen vacancies. Rietveld refinement of the X-ray powder diffraction data of Pr2/3Ba1/3CoO2.98 was successfully performed by a single phase with an orthorhombic Pnma Pr/Ba cation-disordered perovskite-type structure. The bond valence sum of Co cation, 3.11 and thermogravimetric measurements suggested the coexistence of Co3+, Co4+, Pr3+ and Pr4+ cations in the bulk Pr2/3Ba1/3CoO2.98. The X-ray photoemission spectroscopy of Pr2/3Ba1/3CoO2.98 indicated the coexistence of these four cations at the sample surface, which would improve the electrocatalysis. The electrical conductivity · of Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO3 1 δ was higher than that of Pr/Ba cation-ordered layered perovskite PrBaCo2O6 1 δ. The · of Pr2/3Ba1/3CoO3 1 δ and PrBaCo2O6 1 δ decreased with an increase of temperature. The concentration of oxygen vacancies δ of Pr2/3Ba1/3CoO3 1 δ increased with increasing temperature. Electrochemical measurements of the Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO2.98 indicated higher OER and ORR catalytic activities, compared to the Pr/Ba cation-ordered layered perovskite PrBaCo2O6 1 δ. The Pr2/3Ba1/3CoO2.98 exhibited higher bifunctional electrocatalytic activities compared with many bifunctional catalysts in the literature. These results highlight the Pr/Ba cation-disordered perovskite-type Pr2/3Ba1/3CoO3 1 δ as a promising bifunctional catalyst for renewable energy applications.
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U2 - 10.2109/jcersj2.18076
DO - 10.2109/jcersj2.18076
M3 - Article
AN - SCOPUS:85054839634
SN - 1882-0743
VL - 126
SP - 814
EP - 819
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
IS - 10
ER -
